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MB90800 Datasheet(PDF) 82 Page - Fujitsu Component Limited. |
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MB90800 Datasheet(HTML) 82 Page - Fujitsu Component Limited. |
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82 / 92 page  MB90800 Series 82 DS07-13733-6E (2) Notes on Using A/D Converter • About the external impedance of analog input and its sampling time A/D converter with sample & hold circuit. If the external impedance is too high to keep sufficient sampling time, the analog voltage charged to the internal sample and hold capacitor is insufficient, adversely affecting A/D conversion precision. Therefore, to satisfy the A/D conversion precision standard, consider the relation-ship between the external impedance and minimum sampling time and either adjust the resistor value and operating frequency or decrease the external impedance so that the sampling time is longer than the minimum value. And, if the sampling time cannot be sufficient, connect a capacitor of about 0.1 μF to the analog input pin. • About errors As | AVCC − AVSS | becomes smaller, values of relative errors grow larger. • Analog input circuit model R C Comparator Analog input RC MB90803 (S) 1.9 k Ω (Max) 32.3 pF (Max) MB90F804-201(101)/F803(S)/F809(S) 1.9 k Ω (Max) 25.0 pF (Max) MB90V800 1.9 k Ω (Max) 32.3 pF (Max) Note : The values are reference values. During sampling : ON 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 MB90803(S)/ MB90V800 MB90F804-201(101)/ MB90F803(S)/ MB90F809(S) 20 18 16 14 12 10 8 6 4 2 0 012 3 45 7 MB90803(S)/ MB90V800 8 MB90F804-201(101)/ MB90F803(S)/ MB90F809(S) 6 (External impedance = 0 kΩ to 100 kΩ) (External impedance = 0 kΩ to 20 kΩ) Minimum sampling time [ μs] Minimum sampling time [ μs] • The relationship between external impedance and minimum sampling time |
Similar Part No. - MB90800_09 |
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Similar Description - MB90800_09 |
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